The chair looked rather hard,but in fact it is very comfortable to sit on.各路英语才子们,小妹不知道句子中为什们会有个on,麻烦各位想想,给个回答,

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The chair looked rather hard,but in fact it is very comfortable to sit on.
各路英语才子们,小妹不知道句子中为什们会有个on,麻烦各位想想,给个回答,

因为sit 是不及物动词,必须有一个介词on在后,才能连接宾语chair

因为还原句子后,是sit on it (the chair),
it 提到句首做主语了,但 on 还保留着,否则 sit it 是不通的。